Compound rotary engine.



Patented Mar. 21, 1911.

i IMMJ L. K. SIVERTSON. GQMPGUND BoTARY ENGINE. APPLICATION FILED 110V. 25:19u.

i Attorneys.

L. K. SIVERTSON. GOMPOUND ROTARY ENGINE. APPLIGATIGN FILED Nov. as," 1910,

987,264. Patented Mar.21,1911.

a SHEETS-SHEET' Q ,Il J5 L27 ventor U Atto l' n eys L. K. SIVERTSON. GOMPOUND ROTARYl ENGINE. APPLIUATIDN rum: Nov. 25, 1910.

Patented. Man-21, 1911.

i Attorneysy UN STATES PATENT OFFICE.

LUCAS EK. -SIVECRTSON, 0F CARBINGTON, NORTH DAKOTA.

ooMroUNn normar ENGINE.

Specicationof Letters Patent.

'Patented Mar. 2.1, 1.911.

Application iiled November 25, 1910. SeriallNo. 6943098.

To all whom tfmay concern:

Be itknovvn that I, LUCAS K. a citizen of the United States, residing at Carrington, yin4 the ycounty of Foster and State "of North Dakota, have invented anew Sivnnrson,

and usei'nl Compound Rotary Steam-En gine, of which the 'following is a -sI-)eciiica issued May 21, 1907, #854,001

The object ofthe invention is to provide a simple engine of the character indicated in which .a double expansion of the saine steam is utilized for the ,purpose of driving the engine thus econoniizing the useof steam 1 land utilizing its expansive force to a maXi-' mumdegree to attain mechanical movementA in the parts of the engine With gthis object lin vieW the engine in-g cludes a fixed 'hollowshaft having a valve.4

. ofpeculiar-configuration locatedl in the same and adapted to govern ports lprovided in: the vsaid shaft. Piston casings are mounted; for rotation about "the shaft and pistons ure Afixed :to the shaft :and are located in their respective 'casings One ofthe said casingst is of :greaterdiameter -than the 'other and it is 'in Ethe larger casing that the second orf compound expansion -of the steam 'takes place.

'The structure also includes mechanical: deg tails which will be explained hereinafter,

and' 'means is provided for reversing or changing the direction in which the casing will'frotate =at Will.

-Infthe dravvings,-Fi'gure 1 is a-longitudinal 4sectional vievi7 of the `lengine cut -on Y'the lines 1 1 of Figs. 2 and 3. Fig. 2 is vatransverse sectional view-0f the engine cuton the line 2-2--of Fig. 1. Fig. 3 '1s a transverse.

sectional View of the engine cut on the line 3-3 oFig. 1.y Fig. 11 is a perspective vienT of aportion of the engine shaft. Fig. 5 is a sectional view 'of a =porti0n of the engine casing. Fig. 6 is a sectionalview of a -portion 'offon'eof the 'casing heads. Fig. 7 is a sectional View of a Iport-ion of the easingpar tition. f-Fig. 8 is an -end view-'of an ahntment. Fig. '9 :isva perspective View 'of a valve used in the; engine'.y

The engine l consists .of-'afhollovv 'shaft 1 'which in practlce is held in. stationary position `by any suitable means. The fitti-ng 2 is l'fixed 'to one yend. of @the shaft `1 and through the said fitting steam is admitted to 4the interior of the shaft. That end ofthe shaft 1 opposite the end thereof at which -thefitting 2 is mounted is open and-constii extends along "the greater radins of the pis- "ton and is provided at its outerv portion with a -recess'S Which slida-hlyf'receives a packing member 9. "The said partition 7 is provided at its opposite sides lwith steam ducts i1() through which steam may pass ffrom the interior of the episton into :the recess-8 and serve iis-means for 'forcing 4the packingmelnber into engagement with the -innerperiphery o'f'thccasing -11 in which the -said pistons Iare housed. The piston 5 is-provided with steam cavities .I 12 and 13 Which -are the counter -parts of each other and which are :located atithe opposite sides ofthegpartition 7 ofthe said pist-on. The said piston isr therrnore Apro-vided With steam -cliariels 111 and 15 and lthe inner ends of the said cavitiesfand the Vinner ends of the :said channels fareladapted '-to register with channels and ports provided in a valve journaledinjthe shaft 1 as will be hereinafter explained.

'The casing l1 is provided vWith diainetrically opposite cavities '16 the inner ends of 'which communicate Withthe interior :of' the said casing. .Abutments 1-7. areslidably located in the cavities 16 and each abutmentispro` vided at itsl inner end With apivoted valve "portion 18 which rests against the periphery of the 'piston 5. vSuitable packings 19 may vbe provided between 'the sides of the abutnients 17-and the vside Walls ofthe cavities 16 and circular channels 2O are formed at 'the ends of the piston 5 and receive .projecting end portions of the said ahntments 17 whereby the valved portions 18 are' heldin close Contact with the periphery of the pisl ton 5 as the casing 11 rotates. Heads 21 close'the-ends-of the casing l1l and each head is provided with a bearing-22 which 'is jour vnatled u on fthe shaft l. Cavities 23 are `.provide 'in the bearingsi22` andare adapted lo receive pai-citings and an oil duct 24 extcn'ds longitudinally of the.shaft 1 and comn'nlnicates with all of the cavities23 and may be used as means for conveying oil to the said cavities for the purposes of lubrication.

A })artition 25 divides the casing 11 into two end portions in one of which the piston 5 'hereinbefore described is located and in the other of Which is located the piston G. The' partition 25 is also provided With grooves adapted to guide the end portions of the abutments 17 and the valves carried thereby. V

The piston Gis provided with steam cavities 26 and 27 and steam channels 28 and 29. The inner ends of these cavities and channels communicate with the interior of the piston and the outer ends thereof are at the periphery of thepiston. The piston 6 is provided lwith a partition and packing 30 similar to the partition 7 and packing 9 de scribed" in connection with the piston 5. The casing 11 is also provided with abutments 31 similar in construction and arrangement to the abutment 17 hereinbefore described and the said abutments 31 operate against1 the periphery of the piston 6 in a similar manner to the operation of the abut- Ifnents 17 upon the periphery of the piston 5;

A rotatable valve 32 is journaled in the` shaft 1 and is provided with a stem 33 which extends longitudinally of the said sha-ft and projects through the fitting 2 provided at the end of the shaft. An opera-ting handle lever 34 is fixed to the projecting end of the valve stem 33. The valve 32 is provided With a steam channel 353l which at times is brought into register with the inner end of the steam cavity 12 in the piston 5. When this is done one end of a steam channel 36 also provided in the valve .33 communicates with the inner end of the cavity 15 in the piston 5 and the other end of the said channel 36Y communicates With thecavity 27 in the piston 6. Also the said valve 32 is provided With a steam channel 37 which, when the channel 35 is in communication with the cavity 12 in the piston 5 the said channel 37 communicates With the cav" ity 28 in the piston 6 and also with the eX- haust passage 4 in the end of the said shaft. The valve 32 is further provided with a steam duct 38 Which When 'the channel 35 communicates With the cavity 12 the said duet establishes communication Abetween the cavity 13 of the piston 5 and the exhaust passage 4 of the shaft. The said valve 32 is also provided with a steam duc-t 39 which communicates at one end with the duct 38 and at its other end is adapt-ed to c0mmuni cate With the cavity 26 of the piston 6 when' the steam channel 35 communicates with the cavity 10. of the piston 5.'

Presuming that the steam `-channels and steam ducts are in communication with the 6 the channel .-35 into the cavity 112 oil the piston 5.

rlhe ste-.1m will pass out of the said cavity at its outer end and come in contact with the sides of one of the abutments 17 located in the casing 11. Thus as the said steam exF pands the casing 11 is carried around. As

soon as theV abutlrufnt against which the steam is operating passes beyond the outer end of the passage 15 in the piston 5 the said steam may exhaust down. through the said passage into the steam channela valve 32. The steam will pass along the said channel and enter the cavity 27 in the piston 6 and pass out at the outer end of the said cavity. From the said cavity the steam "will impact against the side of one of the abutments 31 und the said stean'i .i1-r thus permitted to exercise a second expansion which will augment the rotary movement of the casing 11. When the abutment 31 passes beyond the end of the passage 28 in the piston said steam may exhaust through the said passage into the steam channel 37 from whence it passes into the exhaust passage 4 of the shaft 1. At the same time that the steam is operating in the piston as above described it is possible 'and quite likely that some steam will be trapped in both of the said pistonsl and in order to prevent back pressure from the same the steam that is trapped for inst-ance in the piston 5 in advance of the abutment 17 will be forced around by the said abutment 17 as it passes 1 beyond the end of the passage 5 and the said trapped steam will be forced through the cavity 13 into the duct 38 and from the said duct will pass into the exhaust passage et of the shaft 1. Aga-in should any steam or pressure be trapped in the piston 6 it will 'be carried around in advance of the abutment 31 and will be forced through t-he cavity 26 and steam duct 39 into the duct 38 from which it will pass into the exhaust passage 4. Thus it will' he seen that provision is made for rotating the casing 11 in one dil rection. Presuming now it is desired to rotate the said casing in an opposite direction an operator grasps the handle lever 34; and turns the stem of the valve 33 so that the steam passage 35 of the said valve 32 is brought into communication with the cavity 15 in the.piston 5. This movement will bring the ends of the steam channel 36 into communication with the cavity 12 in the piston 5 and the cavity 26 in the piston 6. Thus the steam will be admit-ted to the said pistons in the opposite direction from that first above described and the casing l1 Will be driven around the piston in the opposite direction. The turning movement on the part of the valve'32 will bring the various 36 in' the exhaust ducts and passages into register with the proper cavities and steam passages so that the exhauststeam is carried through ing steam cavities,

the engine and liberated into, the exhaust passage 4. A belt rim 40is attached to the periphery of the casing 11 and a belt may be applied to thel movement established in the' casing, 11 may be transmitted to machines or other objects,

Therefore it will be seen that a rotary engine is provided in which a compound lex pansion ofthefsteam is utilized for thefpuro the pose of actuating the operable parts engine and this utilization of the compound expansion of the steam will result in material saving ofsteam pressure b3' which economical advantages are attaine Having thus described the invention, what I claim as new and desire to secure by Letters Patent is I. An engine comprising a hollow shaft, pistons fixed to the shaft and eccentrically positioned upon the same with their longer radii extending in opposite directions at the opposite sides of the shaft, said pistons hava casing receiving the said rim whereby the rotary l pistons and having against the peripheries valve located in the shaft and arran e convey steam to one of the pistons an from t-he iirst said piston to the second piston abutments bearing of the pistons, a d to and then convey the exhaust steam from the second mentioned piston.

2. An engine comprising a hollow fixed shaft, pistons fixed to the shaft and eccentrically positioned thereon and having their longerA radii extending in opposite directions at the opposite sidesof the shaft, a rotatable valve located in the shaft'and'having channels adapted to convey steam to the first piston and transmit the steam from the first l piston` to the second mentioned piston and convey the exhaust steam from the second mentioned piston.

In testimony that I claim the foregoing as my own, I have hereto aixed my signaturev in thel presence of two witnesses. i

.LUCAS K. sivERTsoN.

Witnesses THORVAL BERG, P. HANSEN. 

